zephyr: Use emul_dma for Virtual DAI on i.MX8MP

Author: SurajSonawane2415

app/boards/imx8mp_evk_mimx8ml8_adsp.overlay

@@ -12,6 +12,12 @@
 	};
 };
 
+/ {
+	emul_dma: dma {
+		compatible = "zephyr,dma-emul";
+	};
+};
+
 &sdma3 {
 	status = "okay";
 };

zephyr/include/sof/lib/dma.h

@@ -99,6 +99,7 @@ struct comp_dev;
 #define SOF_DMA_DEV_HS		BIT(13) /**< connectable to ACP HS I2S */
 #define SOF_DMA_DEV_MICFIL	BIT(14) /**< connectable to MICFIL fifo */
 #define SOF_DMA_DEV_SW		BIT(15) /**< connectable to ACP SW */
+#define SOF_DMA_DEV_DAI_VIRTUAL		BIT(16) /**< connectable to ACP SW */
 
 /* DMA access privilege flag */
 #define SOF_DMA_ACCESS_EXCLUSIVE	1

zephyr/lib/dma.c

@@ -151,6 +151,17 @@ SHARED_DATA struct sof_dma dma[] = {
 },
 #endif
 #if defined(CONFIG_SOC_MIMX8ML8_ADSP)
+#if CONFIG_DAI_VIRTUAL
+{
+	.plat_data = {
+		.dir = SOF_DMA_DIR_MEM_TO_MEM,
+		.devs = SOF_DMA_DEV_DAI_VIRTUAL,
+		.channels = 32,
+		.period_count = 2,
+	},
+	.z_dev = DEVICE_DT_GET(DT_NODELABEL(emul_dma)),
+},
+#else
 {
 	.plat_data = {
 		.dir = SOF_DMA_DIR_MEM_TO_DEV | SOF_DMA_DIR_DEV_TO_MEM,
@@ -160,6 +171,7 @@ SHARED_DATA struct sof_dma dma[] = {
 	},
 	.z_dev = DEVICE_DT_GET(DT_NODELABEL(sdma3)),
 },
+#endif /* CONFIG_DAI_VIRTUAL */
 {
 	.plat_data = {
 		.dir = SOF_DMA_DIR_HMEM_TO_LMEM | SOF_DMA_DIR_LMEM_TO_HMEM,